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Just to add more information, as someone else noted it's not the pubic bone they're hitting in the comic. The pubic bone is higher up and more towards you're front. What it looks like he's pressing is the perineum. You can apply pressure to the prostate by pushing on the perineum which is more than likely what is happening. But eh. Yaoi. /Shrug
I just had to search it up and see if it’s real;
The pubis, or pubic bone, is one of the bones that make up the pelvis. It is ventral and anterior. In other words, it is at the front in humans, and below in most other mammals. The left and right hip bones join at the pubic symphysis. In the female, the pubic bone in front is covered by the urethral sponge.